<template>
  <div class="login-container">
    <el-form
      ref="loginForm"
      :model="loginForm"
      :rules="loginRules"
      class="login-form"
      auto-complete="on"
      label-position="left">
      <div class="title-container">
        <h3 class="title">
          {{ $t('login.title') }}
        </h3>
        <lang-select class="set-language"/>
      </div>

      <el-form-item prop="username">
        <span class="svg-container">
          <icon
            name="user"
            scale="1" />
        </span>
        <el-input
          v-model="loginForm.username"
          :placeholder="$t('login.username')"
          name="username"
          type="text"
          auto-complete="on"
        />
      </el-form-item>

      <el-form-item prop="password">
        <span class="svg-container">
          <icon
            name="key"
            scale="1" />
        </span>
        <el-input
          v-model="loginForm.password"
          :type="passwordType"
          :placeholder="$t('login.password')"
          name="password"
          auto-complete="on"
          @keyup.enter.native="handleLogin"
        />
        <span
          class="svg-container show-pwd"
          @click="showPwd">
          <icon
            :name="passwordType === 'password' ? 'eye' : 'eye-slash'"
            scale="1"/>
        </span>
      </el-form-item>

      <el-button
        :loading="loading"
        type="primary"
        style="width:100%;margin-bottom:30px;"
        @click.native.prevent="handleLogin">
        {{ $t('login.logIn') }}
      </el-button>
    </el-form>

    <el-tooltip
      effect="dark"
      content="切换背景"
      placement="top">
      <el-button
        class="qie"
        type="primary"
        size="mini"
        icon="el-icon-refresh"
        @click="changeBg"/>
    </el-tooltip>
  </div>
</template>

<script>
  import {title} from '@/config'
  import LangSelect from '@/components/LangSelect'

  export default {
    name: 'Login',
    components: {LangSelect},
    data() {
      const validatePassword = (rule, value, callback) => {
        if (value.length < 6) {
          callback(new Error('The password can not be less than 6 digits'))
        } else {
          callback()
        }
      }
      return {
        loginForm: {
          username: 'admin',
          password: 'qwert@12345'
        },
        loginRules: {
          username: [{required: true, trigger: 'blur'}],
          password: [{required: true, trigger: 'blur', validator: validatePassword}]
        },
        passwordType: 'password',
        loading: false,
        showDialog: false,
        redirect: undefined,
        bgindex: 0
      }
    },
    watch: {
      $route: {
        handler: function(route) {
          this.redirect = route.query && route.query.redirect
        },
        immediate: true
      }
    },
    created() {
      // window.addEventListener('hashchange', this.afterQRScan)
    },
    destroyed() {
      // window.removeEventListener('hashchange', this.afterQRScan)
    },
    methods: {
      showPwd() {
        if (this.passwordType === 'password') {
          this.passwordType = ''
        } else {
          this.passwordType = 'password'
        }
      },
      handleLogin() {
        this.$refs.loginForm.validate(valid => {
          if (valid) {
            this.loading = true
            this.$store.dispatch('LoginByUsername', this.loginForm).then(() => {
              this.loading = false
              // this.$router.push(this.$route.query.redirect || '/')
              this.$router.push({path: this.redirect || '/'})
            }).catch(() => {
              this.loading = false
            })
          } else {
            console.log('error submit!!')
            return false
          }
        })
      },
      changeBg() {
        const image_list = [
          'http://pic1.win4000.com/wallpaper/2019-02-14/5c65108043791.jpg',
          'http://pic1.win4000.com/wallpaper/2/582687feb0f49.jpg',
          'http://pic1.win4000.com/wallpaper/2019-02-14/5c65107bce18d.jpg',
          'http://pic1.win4000.com/wallpaper/9/5854ebc3ae1a7.jpg',
          'http://pic1.win4000.com/wallpaper/2/582687fb30871.jpg'
        ]
        document.getElementsByClassName('login-container')[0].style['background'] = 'url(' + image_list[this.bgindex] + ')'
        document.getElementsByClassName('login-container')[0].style['background-size'] = 'cover'
        if (this.bgindex < image_list.length - 1) {
          this.bgindex += 1
        } else {
          this.bgindex = 0
        }
      }
    }
  }
</script>

<style rel="stylesheet/scss" lang="scss">
  /* 修复input 背景不协调 和光标变色 */
  /* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */

  $bg: #283443;
  $light_gray: #eee;
  $cursor: #fff;

  @supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
    .login-container .el-input input {
      color: $cursor;
      &::first-line {
        color: $light_gray;
      }
    }
  }

  /* reset element-ui css */
  .login-container {
    background: url('../../assets/bg-images/bg0.jpg');
    background-size:cover;
    .el-input {
      display: inline-block;
      height: 47px;
      width: 85%;
      input {
        background: transparent;
        border: 0px;
        -webkit-appearance: none;
        border-radius: 0px;
        padding: 12px 5px 12px 15px;
        color: $light_gray;
        height: 47px;
        caret-color: $cursor;
        &:-webkit-autofill {
          -webkit-box-shadow: 0 0 0px 1000px $bg inset !important;
          -webkit-text-fill-color: $cursor !important;
        }
      }
    }
    .el-form-item {
      border: 1px solid rgba(255, 255, 255, 0.1);
      background: rgba(0, 0, 0, 0.1);
      border-radius: 5px;
      color: #454545;
    }
  }
</style>

<style rel="stylesheet/scss" lang="scss" scoped>
  $bg: #2d3a4b;
  $dark_gray: #889aa4;
  $light_purple: #915cf7;

  .login-container {
    min-height: 100%;
    width: 100%;
    background-color: $bg;
    overflow: hidden;
    .login-form {
      position: relative;
      width: 520px;
      max-width: 100%;
      padding: 160px 35px 0;
      margin: 0 auto;
      overflow: hidden;
    }
    .tips {
      font-size: 14px;
      color: #fff;
      margin-bottom: 10px;
      span {
        &:first-of-type {
          margin-right: 16px;
        }
      }
    }
    .svg-container {
      padding: 6px 5px 6px 15px;
      color: $dark_gray;
      vertical-align: middle;
      width: 30px;
      display: inline-block;
    }
    .title-container {
      position: relative;
      .title {
        font-size: 26px;
        color: $light_purple;
        margin: 0px auto 40px auto;
        text-align: center;
        font-weight: bold;
      }
      .set-language {
        color: #fff;
        position: absolute;
        top: 3px;
        font-size: 18px;
        right: 0px;
        cursor: pointer;
      }
    }
    .show-pwd {
      position: absolute;
      cursor: pointer;
      user-select: none;
    }
    .thirdparty-button {
      position: absolute;
      right: 0;
      bottom: 6px;
    }
    .qie {
      position: absolute;
      right: 0;
      bottom: 0;
      background: transparent;
      border: none;
    }
  }
</style>
